getblockhash - Litecoin

Example code for the getblockhash JSON-RPC method. Complete guide on how to use getblockhash JSON-RPC in GetBlock Web3 documentation.

This method returns hash of block in best-block-chain at height provided.

Parameters

Parameter	Type	Description
height	number (int)	The height index.

Request

cURL

cURL

curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "getblockhash",
    "params": [2750000],
    "id": "getblock.io"
}'

Axios (JavaScript)

axios.js

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "getblockhash",
    "params": [2750000],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data)))
    .catch(error => console.log(error));

Python (requests)

request.py

import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "getblockhash",
    "params": [2750000],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

Rust (reqwest)

main.rs

use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "getblockhash",
            "params": [2750000],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

{
    "result": "2b27dd39d0d380791408561a3f11c45b191ce11f88940128702861409c902168",
    "error": null,
    "id": "getblock.io"
}

Response Parameters

Field	Type	Description
result	string	The hash of the block at the given height (64 character hex string).

Use Case

The getblockhash method is essential for:

• Converting block height to hash

• Sequential block scanning

• Historical data retrieval

• Block indexing operations

• Chain traversal by height

Error Handling

Status Code	Error Message	Cause
403	Forbidden	Missing or invalid ACCESS-TOKEN.
-8	Block height out of range	Height exceeds current chain height.

Integration Notes

The getblockhash method helps developers:

• Navigate the blockchain by height

• Build block height indexes

• Retrieve historical blocks

• Implement block scanners

• Create height-based queries